Precision Digital Corporation PD6622-L2N, Инструкция по эксплуатации

Страница: 36 / 45

Loop Leader PD6620 Series Loop-Powered Flow Rate/Totalizers Instruction Manual
36
Enabling the Function Key Hint
Feature (
HINT
)
Enabling the function key hint feature will cause a hint
message to be displayed when pressing the F1, F2,
or F3 function keys. This text gives a brief description
of what the button is programmed to do. Pressing that
function key a second time will execute that action.
The hint feature does not affect the digital input (DI)
which is intended for immediate execution.
Changing System Settings (
SYSTEM
)
The System menu contains the following menus:
Analog Output Calibration, Restore Factory Defaults,
Totalizer, Backlight, Information, and Internal
Calibration.
Analog Output Calibration
(
AOUTCAL
)
To perform the analog output calibration, it is recom-
mended to use a milliamp meter with a resolution of at
least 0.1 µA to measure the output current. The val-
ues saved internally during this procedure are used
for scaling the 4-20 mA output in the
Setup
menu.
4-20 mA Output Calibration Procedure
1. Go to the Advanced Features menu and
navigate to the
SYSTEM
menu and press
Enter. Navigate to
AOUTCAL
and press Enter.
2. The display will show 4 mA. The Loop Leader
mA output should now be close to 4 mA. Enter
the actual value read by the digital mA meter
on the second line of the display and press
Enter.
3. The display will show 20 mA. The Loop Leader
mA output should now be close to 20 mA.
Enter the actual value read by the digital mA
meter on the second line of the display and
press Enter.
4. The Loop Leader will now calculate the
calibration factors and store them.
5. Press Menu to exit.
Enabling or Disabling the
Backlight (
BACKLITE
)
The backlight may be enabled or disabled using the
Backlight menu. The backlight is enabled by default,
but the input must be wired appropriately for the back-
light to function. See
Safe Area Current Loop (4-20
mA) Connections on page 13 . The voltage drop is the
same if the backlight is not wired or if it is disabled in
the
System
menu.
Viewing System Information
(
INFO
)
System information, such as software (firmware) num-
ber and version, model number, and system tag, may
be viewed in the
INFO
menu. Press the
Right Arrow
button to cycle through all available meter information.
Press
Menu
to go back to the previous menu.